title: Nanoparticulate Pd supported catalysts: size-dependent formation of Pd(I)/Pd(0) and their role in CO elimination.
abstract: A combination of time-resolved X-ray absorption spectroscopy (XAS), hard X-ray diffraction (HXRD), diffuse reflectance infrared spectroscopy (DRIFTS), and mass spectrometry (MS) reveals a series of size-dependent phenomena at Pd nanoparticles upon CO/(NO+O(2)) cycling conditions. The multitechnique approach and analysis show that such size-dependent phenomena are critical for understanding Pd CO elimination behavior and, particularly, that different Pd(I) and Pd(0) centers act as active species for a size estimated by XAS to be, respectively, below and above ca. 3 nm. The relative catalytic performance of these two noble metal species indicates the intrinsic higher activity of the Pd(I) species.
authors.affiliation: Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie-Curie 2, 28049 Madrid, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Iglesias-Juez
authors.forename: Anna
authors.initials: A
authors.lastname: Kubacka
authors.forename: Marcos
authors.initials: M
authors.lastname: Fernández-García
authors.forename: Marco
authors.initials: M
authors.lastname: Di Michiel
authors.forename: Mark A
authors.initials: MA
authors.lastname: Newton
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D053768:Metal Nanoparticles / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size
chemical_list: D010165:Palladium; D002248:Carbon Monoxide